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Why does the water in the upper part of the test tube get converted to steam?
If water is heated from above, the heated molecules at the top will change their state to form steam, as they can hardly transfer the heat energy to the bottom layer due to the convection currents.
Why is the test tube placed in iced water?
Place a test tube, for collecting the distillate, in a beaker of ice or iced/water and position it so that the delivery tube goes well down into it. Heat the bottom of the boiling tube gently. It is very easy to overheat the liquid so it boils too vigorously which will cause it to overflow down the delivery tube.
Why should one heat the upper portion of the liquid rather than the bottom?
If you heat the test tube from the bottom, any liquid can turn into a gas. Heating the test tube at the top allows any gases formed to escape without forcing liquids on top of the gas out of the tube.
During which process of the water cycle does water change from a gas to a liquid?
Condensation is the process by which water vapor in the air is changed into liquid water. Condensation is crucial to the water cycle because it is responsible for the formation of clouds. Condensation is the opposite of evaporation.
Why was the water in test tube A boiled?
Boiling Water in a Test Tube by Holding it in the Hand Introduction: When heated, water above the source of heat gets heated while water below the source of heat remains as it is. The heat gets transferred without movement of the particles. This mode of heat transfer is called conduction.
Why does ice not melt in boiling water?
It has to transfer heat to the colder water, which then transfers heat to the ice cube. This isn’t the case for your cold tap water. Since the water is moving, there’s never a point where the water’s temperature becomes relatively equal to the ice cube.
What happened to the amount of water in the test tube after heating?
The water in the testtube expands as it is heated. There is only one direction to expand in, the glass tube. This is the same phenomenon as in thermometers with a glass bulb on the lower end. Thermometers use a variety of liquids including alcohol (expands more than water) and mercury (is dangerous when spilled).